.mask{
    height: 100%;
    background-image: url(../img/timg.jpg);
}
.mask .box-main{
    position: absolute;
    width: 400px;
    height: 300px;
    left: 50%;
    top: 50%;
    padding: 30px;
    border-radius: 10px;
    transform: translate(-50%, -50%);
    background-color: rgba(60, 60,60, 0.5);
}

/* 用户密码输入框 */
.input-user, .input-pwd{
    position: relative;
    height: 35px;
    width: 75%;
    line-height: 35px;
    text-align: center;
    margin: 50px auto;
}

.input-user input, .input-pwd input{
    position: relative;
    width: 100%;
    height: 100%;
    top: 0;
    padding: 0 0 0 10px;
    box-sizing: border-box;
    outline: none;
    color: #fff;
    background-color: rgba(70, 70, 70, 0.4);
    font-size: 16px;;
    border: 1px solid #999;
    border-radius: 3px;
    z-index: 9999;
    transition: all 0.5s;
}

input:focus{
    border: 1px solid #eee;
}
input::placeholder{
    color: #aaa;
}

.remember-pwd{
    position: relative;
    margin: -25px auto 25px 50px;
}
.remember-pwd>label>span{
    cursor: pointer;
    color: #fff;
}
/*********************/

.input-submit{
    text-align: center;
}

/* 按钮 */
.btn{
    border: 0;
    background-color: #fff;
    outline: none;
    padding: 8px 20px;
    border-radius: 4px;
    font-size: 18px;
    font-weight: 800;
}
.btn.color{
    transition: all 0.3s;
    background-color: #26caf2;
    border: 1px solid #888;
}
.btn:active{
    border: 1px solid #555;
}